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Related Concept Videos

Narcolepsy01:07

Narcolepsy

Narcolepsy is a chronic sleep disorder characterized by pervasive, uncontrolled sleepiness and other sleep disturbances. One of its hallmark symptoms is an abrupt transition to REM sleep upon falling asleep, which causes symptoms typically associated with this phase to occur unexpectedly during wakefulness. These include the following symptoms, which typically last from a minute or two to half an hour.
Sleep-Wake Cycles01:24

Sleep-Wake Cycles

Sleep is an essential physiological process vital to maintaining overall well-being. The reticular activating system (RAS), a network of neurons in the brainstem, regulates wakefulness and sleep. While it may seem passive, sleep consists of distinct cycles, each with its unique characteristics and functions. Two key sleep phases are non-rapid eye movement (NREM) and  rapid eye movement (REM).
NREM Sleep
NREM sleep comprises four progressive stages that seamlessly merge:
REM Sleep Behavior Disorder01:15

REM Sleep Behavior Disorder

REM Sleep Behavior Disorder (RBD) is a sleep disorder characterized by the absence of muscle paralysis that normally occurs during the REM phase of sleep. This absence allows individuals to physically act out their dreams, which are often vivid and disturbing. Common behaviors exhibited during episodes include kicking, punching, and yelling. These actions can be dangerous, potentially leading to injuries for the person with RBD or their bed partner.
RBD is significantly associated with...
Sleepwalking and Sleep Talking01:17

Sleepwalking and Sleep Talking

Somnambulism, commonly known as sleepwalking, involves individuals engaging in activities ranging from simple walking to more complex behaviors such as driving. Sleepwalking typically occurs during the slow-wave sleep stages 3 and 4 early in the night when the person is not dreaming, contradicting the myth that sleepwalkers are acting out their dreams.
Factors that increase the likelihood of sleepwalking include sleep deprivation and alcohol consumption. Contrary to common beliefs, it is safe...
Sedatives and Hypnotics Drugs: Miscellaneous Agents01:17

Sedatives and Hypnotics Drugs: Miscellaneous Agents

Sedatives and hypnotics encompass a wide range of substances, each with its unique mechanism of action, uses, and potential adverse effects.
Melatonin congeners like ramelteon (Rozerem) and tasimelteon (Hetlioz) selectively bind to melatonin receptors (MT1 and MT2) and thus mimic the actions of melatonin, a hormone that regulates sleep-wake cycles. Tasimelteon is primarily used for non-24-hour sleep-wake disorder, common in blind patients. They are also used to treat conditions like insomnia...
Restless Leg Syndrome and Night Terrors01:27

Restless Leg Syndrome and Night Terrors

Restless Leg Syndrome (RLS), also known as Willis-Ekbom disease, is a neurological disorder characterized by an uncontrollable urge to move the legs due to uncomfortable sensations. These sensations typically occur during periods of rest or inactivity, particularly when lying down or sitting, and can severely disrupt sleep.
The exact cause of RLS is not fully understood, but it is believed to involve dopamine, a neurotransmitter that helps regulate muscle movement. Imbalances in dopamine levels...

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Related Experiment Video

Updated: Jun 30, 2026

Manipulation of Epileptiform Electrocorticograms (ECoGs) and Sleep in Rats and Mice by Acupuncture
09:06

Manipulation of Epileptiform Electrocorticograms (ECoGs) and Sleep in Rats and Mice by Acupuncture

Published on: December 22, 2016

[Narcolepsy with cataplexy].

Y Dauvilliers1, I Arnulf

  • 1Service de neurologie, hôpital Gui-de-Chauliac, CHU de Montpellier, Montpellier cedex 5, France. ydauvilliers@yahoo.fr

Revue Neurologique
|September 23, 2008
PubMed
Summary
This summary is machine-generated.

Narcolepsy is a rare sleep disorder characterized by excessive daytime sleepiness and cataplexy. Research suggests a hypocretin deficiency, likely due to an autoimmune process, is the cause, with ongoing research into novel treatments.

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A Chronic Sleep Fragmentation Model using Vibrating Orbital Rotor to Induce Cognitive Deficit and Anxiety-Like Behavior in Young Wild-Type Mice

Published on: September 22, 2020

Related Experiment Videos

Last Updated: Jun 30, 2026

Manipulation of Epileptiform Electrocorticograms (ECoGs) and Sleep in Rats and Mice by Acupuncture
09:06

Manipulation of Epileptiform Electrocorticograms (ECoGs) and Sleep in Rats and Mice by Acupuncture

Published on: December 22, 2016

A Chronic Sleep Fragmentation Model using Vibrating Orbital Rotor to Induce Cognitive Deficit and Anxiety-Like Behavior in Young Wild-Type Mice
06:23

A Chronic Sleep Fragmentation Model using Vibrating Orbital Rotor to Induce Cognitive Deficit and Anxiety-Like Behavior in Young Wild-Type Mice

Published on: September 22, 2020

Area of Science:

  • Neurology
  • Sleep Medicine
  • Immunology

Context:

  • Narcolepsy is a rare, disabling neurological sleep disorder affecting 20-30 per 100,000 individuals.
  • Onset typically occurs in the second decade of life, presenting with excessive daytime sleepiness and cataplexy.
  • Other symptoms include hallucinations, sleep paralysis, and insomnia.

Purpose:

  • To review the clinical features, diagnosis, and current understanding of narcolepsy.
  • To highlight the role of hypocretin deficiency and potential autoimmune mechanisms.
  • To discuss existing and emerging therapeutic strategies.

Summary:

  • Narcolepsy diagnosis involves clinical assessment and polysomnography, with hypocretin deficiency in cerebrospinal fluid being highly specific for narcolepsy with cataplexy.
  • A significant reduction in hypocretin levels, linked to hypocretin neuron loss, is observed in human narcoleptics.
  • While the exact cause is unknown, an autoimmune process is strongly suspected.

Impact:

  • Understanding the hypocretin system's role is crucial for developing targeted narcolepsy treatments.
  • Current treatments include stimulants, antidepressants, and sodium oxybate.
  • Future therapies may focus on hypocretin agonists, histamine H3 antagonists, and immunosuppressants.